Power Conversion Device

Abstract

The power converter (100) includes a main body case (1) having a first substrate (3), a second substrate (4), and a partition wall (12), and accommodating the first substrate in a first accommodating space and the second substrate in a second accommodating space; a harness (9) having a third connector (10) at one end that can be fitted with the first connector and a fourth connector (11) at the other end that can be fitted with the second connector, and electrically connecting the first substrate and the second substrate; and a first connector holding mechanism (20) that holds the third connector and is disposed on the inner peripheral wall surface of the second storage space side, closer to the partition wall than the position where the second connector holding mechanism is disposed, and the partition wall has an opening (13) through which the first connector is inserted, at a position corresponding to the position where the first connector holding mechanism is disposed.

Description

[Technical Field]

[0001] The present disclosure relates to power conversion devices such as general-purpose inverters. [Background technology]

[0002] In electrical devices that have multiple functions using electrical circuit boards, the electrical circuit boards are often divided by function and configured by combining multiple electrical circuit boards to ensure scalability by allowing functions to be added or removed according to the use of the electrical device, and to facilitate maintenance and management.

[0003] For example, in a power conversion device such as a general-purpose inverter, the function of the power conversion device is realized by combining a high-voltage circuit composed of a power module including a switching element such as an IGBT (Insulated Gate Bipolar Transistor) with a low-voltage circuit that controls the entire power conversion device. Because it is best to separate the high-voltage circuit and the low-voltage circuit as much as possible, the circuits that make up the power conversion device are often divided by function onto two or more electric circuit boards, including a main circuit board that mounts the high-voltage circuit and a control board that mounts the low-voltage circuit, and the functions of the power conversion device are realized by electrically connecting them.

[0004] One method for electrically connecting electric circuit boards is to connect them via a harness. For example, Patent Document 1 discloses a method for electrically connecting a main circuit board and a control board via a harness. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-217241 Summary of the Invention [Problem to be solved by the invention]

[0006] In many power conversion devices, a partition wall is provided between the main circuit board and the control board to ensure an insulation distance, and the devices are housed in a main body case. In this case, the main circuit board is housed in a housing space opposite the housing space housing the control board. In a power conversion device with such a structure, connecting the main circuit board and the control board via a harness requires a series of manual operations in a narrow housing space: connecting one end of the harness to one board, inserting the other end of the harness into an opening formed in the partition wall, and then connecting the other end of the harness to the other board. This reduces workability.

[0007] Furthermore, it is desirable to make the harness connecting the main circuit board and the control board as short as possible to reduce the effects of noise, but to shorten the harness, the main circuit board and the control board must be as close to the main case as possible when wiring the harness. Therefore, the operator must reach into the narrow storage space of the main case without a sufficient opening for access. In addition, the main circuit board is equipped with large components such as large-capacity capacitors, which can limit the space available for access, further complicating workability. Because power conversion devices are typically mass-produced in factories, efficient product assembly is important from the perspective of reducing processing costs and shortening lead times.

[0008] The present disclosure has been made in consideration of the above, and aims to provide a power conversion device that can improve the workability of wiring work in which electrical circuit boards separated by partitions are electrically connected with harnesses, thereby making product assembly more efficient. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems and achieve the object, the power conversion device of the present disclosure includes a first board on which a first connector is mounted, a second board on which a second connector is mounted, and , th 1 board , anda main body case that accommodates the second board; a harness that has one end that has a third connector that can be mated with the first connector and the other end that has a fourth connector that can be mated with the second connector, and that electrically connects the first board and the second board; and an inner peripheral wall surface of the main body case. Of a second connector holding mechanism disposed on the peripheral wall surface and holding the fourth connector; Main unit case a first connector holding mechanism disposed on the inner peripheral wall surface and holding the third connector; Ta It is characterized by: [Effects of the Invention]

[0010] The power conversion device disclosed herein has a connector holding mechanism arranged on the inner wall surface of the main body case that holds the connectors at both ends of the harness in advance, and allows the wiring work to be completed simply by storing the electric circuit board in a predetermined position. This improves the workability of the wiring work in which the electric circuit boards that are separated by a partition are electrically connected with the harness, thereby achieving the effect of improving the efficiency of product assembly. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a front view of a power conversion device according to a first embodiment; [Figure 2] 1 is a side view of a power conversion device according to a first embodiment; [Figure 3] 1 is an exploded perspective view of a power conversion device according to a first embodiment; [Figure 4] FIG. 1 is a cross-sectional view schematically illustrating a cross section of a power conversion device according to a first embodiment. [Figure 5] FIG. 1 is a front view of a main body case 1 of a power conversion device according to a first embodiment. [Figure 6] FIG. 1 is a diagram schematically illustrating a first connector holding mechanism 20 of a power conversion device according to a first embodiment. [Figure 7] FIG. 1 is a diagram schematically illustrating a second connector holding mechanism 30 of the power conversion device according to the first embodiment. [Figure 8]1 is a diagram illustrating a procedure for fitting the third connector 10 of the power conversion device according to the first embodiment into the first connector holding mechanism 20. FIG. [Figure 9] FIG. 1 is a diagram illustrating a method for assembling a power conversion device according to a first embodiment. [Figure 10] FIG. 1 is a diagram illustrating a method for assembling a power conversion device according to a first embodiment. [Figure 11] FIG. 1 is a diagram illustrating a method for assembling a power conversion device according to a first embodiment. [Figure 12] FIG. 1 is a diagram illustrating a method for assembling a power conversion device according to a first embodiment. [Figure 13] FIG. 1 is a diagram illustrating a method for assembling a power conversion device according to a first embodiment. [Figure 14] 1 is a flowchart illustrating an assembly procedure for the power conversion device according to the first embodiment. [Figure 15] FIG. 10 is a diagram schematically illustrating a first connector holding mechanism 20A having a guide structure for a power conversion device according to a second embodiment. [Figure 16] FIG. 10 is a diagram schematically illustrating a first connector holding mechanism 20B having another guiding structure of the power conversion device according to the second embodiment. [Figure 17] FIG. 11 is a diagram schematically illustrating a first connector holding mechanism 20C that is detachable from the inner peripheral wall surface of the main body case 1 of the power conversion device according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a power conversion device according to an embodiment of the present disclosure will be described in detail with reference to the drawings. However, the present disclosure is not limited to the embodiment.

[0013] Embodiment 1 Fig. 1 is a front view of a power conversion device according to a first embodiment of the present disclosure, Fig. 2 is a side view of the power conversion device according to the first embodiment, and Fig. 3 is an exploded perspective view of the power conversion device according to the first embodiment.

[0014] The inverter 100, which is a power conversion device, has a main body case 1, a base 2, a control board 3 which is a first board, a main circuit board 4 which is a second board, a front cover 5, and an operation unit 6.

[0015] The main body case 1 is a cylindrical housing with openings on the front and back. The main body case 1 houses a control board 3 and a main circuit board 4. The front is the side of the inverter 100 that an operator who operates the inverter 100 or a worker who maintains the inverter 100 faces. The back is the side opposite the front.

[0016] The base 2 serves as a base on which the main circuit board 4 is placed. The base 2 also functions as a heat sink that dissipates heat generated by the inverter 100. The front cover 5 is a cover that is detachably attached to the main body case 1 and covers the front of the main body case 1. The operation unit 6 is attached to the front of the main body case 1 and is used to operate the inverter 100.

[0017] 4 is a cross-sectional view schematically illustrating a cross section of the power conversion device according to the first embodiment. Fig. 4 shows a cross section taken along line III-III in Fig. 1.

[0018] The control board 3 is mounted with a control circuit that controls the entire power conversion device, a control terminal block, etc. (not shown), and is also mounted with a first connector 7 for connecting to the main circuit board 4 via a harness 9. The main circuit board 4 is mounted with a power module including switching elements such as IGBTs (Insulated Gate Bipolar Transistors), etc. (not shown), and a main circuit terminal block, etc., and is also mounted with a second connector 8 for connecting to the control board 3 via the harness 9. The control board 3 and the main circuit board 4 may be collectively referred to as the boards. The first connector 7 and the second connector 8 may be collectively referred to as the board-side connectors.

[0019] The harness 9 has a third connector 10 at one end that can be mated with the first connector 7, and a fourth connector 11 at the other end that can be mated with the second connector 8, electrically connecting the control board 3 and the main circuit board 4. The third connector 10 and the fourth connector 11 may be collectively referred to as the harness-side connectors.

[0020] A first connector retention mechanism 20 that retains the third connector 10 and a second connector retention mechanism 30 that retains the fourth connector 11 are disposed on the inner peripheral wall surface of the main body case 1. The second connector retention mechanism 30 is disposed on the inner peripheral wall surface of the main body case 1 that faces the second accommodating space, and retains the fourth connector 11. The first connector retention mechanism 20 is disposed on the inner peripheral wall surface that faces the second accommodating space, and is closer to the partition wall 12 than the position where the second connector retention mechanism 30 is disposed, and retains the third connector 10. The first connector retention mechanism 20 and the second connector retention mechanism 30 may be collectively referred to as connector retention mechanisms 40.

[0021] Furthermore, main body case 1 has a partition wall 12 between control board 3 and main circuit board 4. That is, main body case 1 has partition wall 12 that divides the internal storage space into a first storage space that is the storage space on the front side and a second storage space that is the storage space on the rear side, with control board 3 stored in the first storage space and main circuit board 4 stored in the second storage space. By having the partition wall between control board 3 and main circuit board 4, an insulation distance between control board 3 and main circuit board 4 can be ensured.

[0022] 5 is a front view of the main body case 1 when it is not covered by the front cover 5 and the operation unit 6. An opening 13 is formed in the partition wall 12 of the main body case 1 at a position corresponding to the position where the first connector holding mechanism 20 is disposed. When the control board 3 is fixed to a predetermined position on the partition wall 12, the opening 13 becomes an insertion hole for inserting the first connector.

[0023] Next, a specific structure of the connector holding mechanism 40 will be described. Fig. 6 is a diagram schematically illustrating a first connector holding mechanism 20 as an example of a specific structure of the connector holding mechanism 40. The first connector holding mechanism 20 is disposed on the inner peripheral wall surface of the main body case 1. Specifically, the first connector holding mechanism 20 is integrally molded on the inner peripheral wall surface of the main body case 1 by resin molding or the like. By integrally molding, the number of parts can be reduced, thereby suppressing parts management costs and manufacturing costs.

[0024] The first connector holding mechanism 20 has a first pair of arms, consisting of a first right arm 21 and a first left arm 24, that extend from the inner peripheral wall surface of the main body case 1 toward the internal storage space, and is structured so that the first pair of arms sandwich the sides of the third connector 10 and simultaneously support the bottom surface of the third connector 10, thereby holding the third connector 10 in a predetermined position. The bottom surface of the third connector 10 is the surface opposite the mating portion of the third connector 10. The first right arm 21 and the first left arm 24 have shapes that are plane-symmetrical when arranged left and right as shown in FIG. 6.

[0025] The first right arm 21 has a first right side surface hold portion 22 that holds the right side surface of the third connector 10 on its inner wall surface curved in an inverted L shape, and a first right bottom surface hold portion 23 that holds the right bottom surface of the third connector 10 on a plane perpendicular to the first right side surface hold portion 22 (in FIG. 6 , the first right bottom surface hold portion 23 is hidden by the first right side surface hold portion 22 and is not visible). Similarly, the first left arm 24 has a first left side surface hold portion 25 that holds the left side surface of the third connector 10 on its inner wall surface curved in an L shape, and a first left bottom surface hold portion 26 that holds the left bottom surface of the third connector 10 on a plane perpendicular to the first left side surface hold portion 25. The first right side surface hold portion 22 and the first left side surface hold portion 25 may be collectively referred to as a first side surface hold portion 27. Furthermore, the first right bottom surface hold portion 23 and the first left bottom surface hold portion 26 may be collectively referred to as the first bottom surface hold portion 28.

[0026] The first side hold portions 27, i.e., the first right side hold portion 22 and the first left side hold portion 25, sandwich the sides of the third connector 10, thereby restricting the third connector 10 from moving in a direction parallel to the bottom surface of the third connector 10. Furthermore, when an attempt is made to mate the first connector 7 with the third connector 10 held by the first connector holding mechanism 20, the first bottom hold portions 28, i.e., the first right bottom hold portion 23 and the first left bottom hold portion 26, restrict the third connector 10 from moving in the mating direction of the first connector 7.

[0027] So far, the specific structure of the first connector holding mechanism 20 has been explained, but the structure of the second connector holding mechanism 30 is the same as that of the first connector holding mechanism 20, except for the orientation in which it is arranged on the inner wall surface of the main body case 1. Therefore, only the configuration will be explained and a detailed explanation will be omitted.

[0028] FIG. 7 is a schematic diagram of the second connector retention mechanism 30. Similar to the first connector retention mechanism 20, the second connector retention mechanism 30 also has a second pair of arms, consisting of a second right arm 31 and a second left arm 34. Specifically, the second right arm 31 has a second right side hold portion 32 and a second right bottom hold portion 33. The second left arm 34 has a second left side side hold portion 35 and a second left bottom hold portion 36. The second right side side hold portion 32 and the second left side side hold portion 35 may be collectively referred to as a second side hold portion 37. The second right bottom hold portion 33 and the second left bottom hold portion 36 may be collectively referred to as a second bottom hold portion 38. Each component of the second connector retention mechanism 30 performs the same function as the corresponding component of the first connector retention mechanism 20.

[0029] Next, a procedure for fitting the third connector 10 into the first connector holding mechanism 20 will be described. Figure 8 is a diagram illustrating a procedure for fitting the third connector 10 into the first connector holding mechanism 20. As indicated by the white arrow in Figure 8, first, the cable portion of the harness 9 is placed between the first right arm 21 and the first left arm 24, and the third connector 10 is positioned directly above the first connector holding mechanism 20. Next, as indicated by the black arrow in Figure 8, the third connector 10 is inserted between the first right arm 21 and the first left arm 24 from directly above the first connector holding mechanism 20.

[0030] In this case, in order to make it easier to insert the cable portion of the harness 9 between the first right arm 21 and the first left arm 24, it is desirable that the first right arm 21 and the first left arm 24 be arranged on the inner peripheral wall surface with a gap therebetween that is at least wider than the thickness of the cable portion of the harness 9. This procedure makes it possible to easily fit the third connector 10 into the first connector holding mechanism 20. The procedure for fitting the fourth connector 11 into the second connector holding mechanism 30 can be performed in a similar manner, so a description thereof will be omitted.

[0031] Next, a method for assembling the power conversion device according to the first embodiment of the present disclosure will be described. Figures 9 to 13 are diagrams for explaining the method for assembling the power conversion device according to the first embodiment of the present disclosure, and Figure 9 shows a cross section of the main body case 1 taken along line IV-IV in Figure 5. Figure 14 is a flowchart for explaining the procedure for assembling the power conversion device according to the first embodiment of the present disclosure.

[0032] First, as shown in Fig. 9, the harness 9 is inserted into the second housing space from the rear side of the main body case 1 (Fig. 14, Step 1). Then, by the procedure for fitting the connectors at both ends of the harness 9 into the connector holding mechanisms 40 described above, the third connector 10 is held by the first connector holding mechanism 20, and the fourth connector 11 is held by the second connector holding mechanism 30, as shown in Fig. 10 (Fig. 14, Step 2). At this time, it is not necessary to arrange the control board 3 on the front side of the main body case 1, and it is not necessary to arrange the main circuit board 4 on the rear side of the main body case 1. Therefore, the work can be performed with the front and rear sides of the main body case 1 fully open, and the harness 9 can be easily attached to the connector holding mechanism 40.

[0033] Next, as shown in Fig. 11, the control board 3 is accommodated in a predetermined position within the first accommodation space (Fig. 14, Step 3). The control board 3 is attached to a predetermined position on the partition wall 12 with screws or the like, thereby accommodating the control board 3 in the predetermined position within the first accommodation space. More specifically, fixing points for the control board 3 are provided in predetermined positions on the partition wall 12, and the control board 3 is accommodated in the predetermined position within the first accommodation space by fixing the control board 3 to the fixing points with screws or the like, with the surface on which the first connector 7 is mounted facing the opening 13.

[0034] By doing this, the first connector 7 moves in the mating direction indicated by the downward black arrow through the opening 13 formed in the partition wall 12, while the third connector 10 is restricted by the first bottom holding portion 28 so that it does not move even if it is pushed in the mating direction of the first connector 7, and therefore the first connector 7 and the third connector 10 mate (Figure 14 Step 4).

[0035] Furthermore, the main circuit board 4 is accommodated in a predetermined position within the second accommodation space (Step 5 in FIG. 14). This causes the second connector 8 to move in the mating direction indicated by the upward black arrow, and the second connector 8 and the fourth connector 11 are mated (Step 6 in FIG. 14). At this time, the main circuit board 4 is previously attached to the base 2 with screws or the like, and the base 2 with the main circuit board 4 attached is then attached to the main case 1, whereby the main circuit board 4 is accommodated in the predetermined position within the main case 1. More specifically, fixing points for the main circuit board 4 are provided in predetermined positions on the base 2, and the main circuit board 4 is fixed to the fixing points with screws or the like with the surface on which the second connector 8 is mounted facing away from the base 2, and the base 2 with the main circuit board 4 attached is then attached to the main case 1, whereby the main circuit board 4 is accommodated in the predetermined position within the main case 1.

[0036] Finally, as shown in Fig. 12, the operation unit 6 and the front cover 5 (not shown) are assembled to the main body case 1 (Fig. 14, Step 7). As a result, the inverter 100 is completely assembled as shown in Fig. 13. Note that Steps 5 and 6 may be performed first, followed by Steps 3 and 4.

[0037] As described above, in the power conversion device of this embodiment, the connectors at both ends of the harness 9 are held in advance by the connector holding mechanism 40 disposed on the inner peripheral wall surface of the main body case 1, and the first connector 7 mounted on the control board 3 can be mated with the third connector 10 of the harness 9 simply by assembling the control board 3 to the partition wall 12, and the second connector 8 mounted on the main circuit board 4 can be mated with the fourth connector 11 of the harness 9 simply by assembling the base 2 to which the main circuit board 4 is attached to the main body case 1. Therefore, in the work of electrically connecting the control board 3 and the main circuit board 4, which are separated by a partition wall, with the harness 9, if the harness 9 is attached to the main body case 1 in advance by the connector holding mechanism 40 when the access openings on the front and back sides of the main body case 1 are fully open, then the wiring connection can be completed simultaneously by simply assembling the circuit boards, thereby improving the workability of the wiring work and improving the efficiency of product assembly.

[0038] In this embodiment, the case where the control board 3 and the main circuit board 4 are electrically connected by the harness 9 has been described. However, the first and second boards are not limited to the control board 3 and the main circuit board 4, and the present invention can be similarly applied to a case where electrical circuit boards separated by a partition wall are electrically connected by a harness. That is, the connectors at both ends of the harness 9 are held in advance by the connector holding mechanism 40 disposed on the inner peripheral wall surface of the main body case 1. Then, simply by accommodating the first board in a predetermined position within the first housing space, the first connector 7 mounted on the first board can be mated with the third connector 10 of the harness 9, and simply by accommodating the second board in a predetermined position within the second housing space, the second connector 8 mounted on the second board can be mated with the fourth connector 11 of the harness 9. As a result, even when electrically connecting electrical circuit boards separated by a partition wall with a harness, the workability of the wiring work can be improved, thereby improving the efficiency of product assembly.

[0039] Embodiment 2 If the connector holding mechanism does not hold the harness connector in the correct position, there is a risk that the connector on the board will not mate properly due to misalignment. The correct holding position is the position of the harness connector that allows it to mate with the board connector when the board is accommodated in a predetermined position.

[0040] Therefore, in order to hold the harness-side connector in the correct holding position, it is better to make the gap between the harness-side connector and the connector holding mechanism as small as possible so that the harness-side connector does not shift from the correct holding position when the harness-side connector is held in the connector holding mechanism. In the case of the shape of connector holding mechanism 40 of embodiment 1, in order to make the gap between the harness-side connector and connector holding mechanism 40 as small as possible, it is necessary to design the position of the inner wall surface of connector holding mechanism 40 to match the outer size of the harness-side connector as closely as possible. However, if this is done, when fitting the harness-side connector into connector holding mechanism 40, the harness-side connector cannot be fitted properly unless it is accurately brought directly above connector holding mechanism 40.

[0041] Therefore, in the second embodiment, a configuration having a guide structure that makes it easier to guide the harness-side connector into the correct holding position when fitting it into the connector holding mechanism will be described. Explanation of the same parts as in the first embodiment will be omitted, and only parts that differ from the first embodiment will be described.

[0042] As in the first embodiment, a first connector holding mechanism 20A for holding the third connector 10 and a second connector holding mechanism 30A for holding the fourth connector 11 are disposed on the inner peripheral wall surface of the main body case 1. The first connector holding mechanism 20A and the second connector holding mechanism 30A are connector holding mechanisms having a guide structure. Figure 15 is a diagram schematically illustrating, as an example, the first connector holding mechanism 20A having a guide structure.

[0043] As in the first embodiment, the first connector holding mechanism 20A has a first right arm 21A and a first left arm 24A. The first right arm 21A has a first right side surface hold portion 22A and a first right bottom surface hold portion 23 (in FIG. 15, the first right bottom surface hold portion 23 is hidden by the first right side surface hold portion 22A and is not visible). The first left arm 24A has a first left side surface hold portion 25A and a first left bottom surface hold portion 26. The first right side surface hold portion 22A and the first left side surface hold portion 25A may be collectively referred to as first side surface hold portion 27A.

[0044] The first side hold portion 27A shown in FIG. 15 has a first inclined surface 41 on the inner wall surface of the first side hold portion 27A, in a region opposite the first bottom hold portion 28. That is, the first side hold portion 27A has the first inclined surface 41 on the inner wall surface of the entrance portion through which the third connector 10 is inserted. When fitting the third connector 10 into the first connector retention mechanism 20A, even if the third connector 10 cannot be accurately brought directly above the first connector retention mechanism 20A, the first inclined surface 41 guides the third connector 10 into the center of the first connector retention mechanism 20A, making it easy to fit the third connector 10 into the correct retention position of the first connector retention mechanism 20A. Therefore, this configuration further improves the workability of the wiring work and increases the efficiency of product assembly.

[0045] The second connector holding mechanism 30A has a similar structure to the first connector holding mechanism 20A, except for the orientation of the second connector holding mechanism 30A on the inner peripheral wall surface of the main body case 1. Therefore, detailed description and illustrations thereof will be omitted. Similar to the first connector holding mechanism 20A, the second connector holding mechanism 30A also has a first inclined surface on the inner wall surface of the second side holding portion, in a region opposite the second bottom holding portion. That is, the second side holding portion has a first inclined surface on the inner wall surface of the entrance portion through which the fourth connector 11 is inserted. Each component of the second connector holding mechanism 30A performs the same function as the corresponding component of the first connector holding mechanism 20A.

[0046] Next, an example of another guide structure will be described. As in the first embodiment, a first connector holding mechanism 20B for holding the third connector 10 and a second connector holding mechanism 30B for holding the fourth connector 11 are disposed on the inner peripheral wall surface of the main body case 1. The first connector holding mechanism 20B and the second connector holding mechanism 30B are connector holding mechanisms having a different guide structure from the first connector holding mechanism 20A and the second connector holding mechanism 30A. Figure 16 is a diagram schematically illustrating, as an example, the first connector holding mechanism 20B having a different guide structure.

[0047] Similar to the first embodiment, the first connector holding mechanism 20B has a first right arm 21B and a first left arm 24B. The first right arm 21B has a first right side surface hold portion 22B and a first right bottom surface hold portion 23B (in FIG. 16, the first right bottom surface hold portion 23B is hidden by the first right side surface hold portion 22B). The first left arm 24B has a first left side surface hold portion 25B and a first left bottom surface hold portion 26B. The first right side surface hold portion 22B and the first left side surface hold portion 25B may be collectively referred to as a first side surface hold portion 27B. The first right bottom surface hold portion 23B and the first left bottom surface hold portion 26B may be collectively referred to as a first bottom surface hold portion 28B. The first side surface holding portion 27B has a rib 42 extending vertically from the first bottom surface holding portion 28B on the inner wall surface of the first side surface holding portion 27B. The rib 42 has a second inclined surface 43 at its tip. Note that, as shown in FIG. 16, the rib 42 may also be provided on the inner peripheral wall surface of the main body case 1.

[0048] The positions of the inner wall surfaces of first right side face hold portion 22B and first left side face hold portion 25B are structured to extend outward by the thickness of ribs 42 from the positions of the inner wall surfaces of first right side face hold portion 22 and first left side face hold portion 25 in embodiment 1, and the multiple ribs 42 sandwich third connector 10 from the side. By doing so, even if ribs 42 are arranged on the inner wall surface of first side face hold portion 27B, the third connector 10 can be fitted into first connector holding mechanism 20B because the positions extend outward by the thickness of ribs 42.

[0049] Furthermore, when the third connector 10 is held in the first connector retention mechanism 20B, there is almost no gap between the third connector 10 and the rib 42 except at the second inclined surface 43, so that the third connector 10 can be held in the correct retention position. When fitting the third connector 10 into the first connector retention mechanism 20B, even if the third connector 10 cannot be accurately brought directly above the first connector retention mechanism 20B, the second inclined surface 43 guides the third connector 10 into the center of the first connector retention mechanism 20B, making it easy to fit the third connector 10 into the correct retention position of the first connector retention mechanism 20B. Therefore, this configuration further improves the workability of the wiring work and increases the efficiency of product assembly.

[0050] The second connector holding mechanism 30B has the same guide structure as the first connector holding mechanism 20B, except for the orientation in which it is disposed on the inner peripheral wall surface of the casing 1. Therefore, detailed description and illustrations thereof will be omitted. Similar to the first connector holding mechanism 20B, the second connector holding mechanism 30B also has a rib 42 extending vertically from the second bottom holding portion on the inner wall surface of the second side holding portion. The rib 42 has a second inclined surface 43 at its tip. A rib 42 may also be disposed on the inner peripheral wall surface of the casing 1. Each component of the second connector holding mechanism 30B performs the same function as the corresponding component of the first connector holding mechanism 20B.

[0051] Embodiment 3 In the first embodiment, an example was shown in which the connector holding mechanism 40 was integrally molded on the inner peripheral wall surface of the main body case 1, but the connector holding mechanism is not limited to being integrally molded as long as it can be disposed on the inner peripheral wall surface of the main body case 1. In the third embodiment, a method of disposing the connector holding mechanism on the inner peripheral wall surface of the main body case 1, which is different from the first embodiment, will be described. Explanations of the same parts as in the first embodiment will be omitted, and only parts that differ from the first embodiment will be described.

[0052] As in the first embodiment, a first connector holding mechanism 20C for holding the third connector 10 and a second connector holding mechanism 30C for holding the fourth connector 11 are arranged on the inner peripheral wall surface of the main body case 1. The first connector holding mechanism 20C and the second connector holding mechanism 30C are connector holding mechanisms that are detachable from the inner peripheral wall surface of the main body case 1.

[0053] 17 is a diagram schematically illustrating a first connector holding mechanism 20C as an example of a specific structure of a connector holding mechanism that is detachable from the inner peripheral wall surface of the casing 1. As shown in FIG. 17, the first connector holding mechanism 20C has a protrusion 44 at a portion that contacts the inner peripheral wall surface of the casing 1. The casing 1 also has a hole 45 at a position on the inner peripheral wall surface that corresponds to the protrusion 44 when the first connector holding mechanism 20C is disposed on the inner peripheral wall surface. The first connector holding mechanism 20C is disposed on the inner peripheral wall surface of the casing 1 by fitting the protrusion 44 into the hole 45.

[0054] In this way, the first connector holding mechanism 20C may be provided with a protrusion 44 at the portion that contacts the inner wall surface of the main body case 1, and the first connector holding mechanism 20C may be arranged on the inner wall surface of the main body case 1 by fitting the protrusion 44 into a hole 45 provided on the inner wall surface of the main body case 1.

[0055] There would be no problem if the arrangement of the connectors mounted on the control board 3 and the main circuit board 4 could be made common to all models of inverter 100, but depending on the model of inverter 100, it may not be possible to make them common and a different arrangement may be necessary. In such a case, since the connector holding mechanism 40 of the first embodiment is integrally molded on the inner peripheral wall surface of the main body case 1, it is necessary to prepare a main body case 1 for each model.

[0056] In the third embodiment, holes 45 are provided in advance at different positions on the inner peripheral wall surface of the main body case 1 and openings 13 are provided in advance at different positions on the partition wall 12 in accordance with the different connector arrangements for the control board 3 and the main circuit board 4 for each model. This allows the position at which the connector holding mechanism is disposed to be changed according to the model of the inverter 100. Therefore, even if the connector arrangements for the control board 3 and the main circuit board 4 differ depending on the model of the inverter 100, the main body case 1 can be used in common, and there is no need to prepare multiple main body cases 1 for each model. This allows parts management costs and manufacturing costs to be reduced.

[0057] The second connector retention mechanism 30C has the same structure as the first connector retention mechanism 20C, except for the orientation in which it is disposed on the inner peripheral wall surface of the casing 1. Therefore, detailed description and illustrations thereof will be omitted. Like the first connector retention mechanism 20C, the second connector retention mechanism 30C also has a protrusion 44 at a portion that contacts the inner peripheral wall surface of the casing 1. The casing 1 also has a hole 45 at a position on the inner peripheral wall surface that corresponds to the protrusion 44 when the second connector retention mechanism 30C is disposed on the inner peripheral wall surface. The second connector retention mechanism 30C is disposed on the inner peripheral wall surface of the casing 1 by engaging the protrusion 44 with the hole 45. Each component of the second connector retention mechanism 30C fulfills the same function as the corresponding component of the first connector retention mechanism 20C.

[0058] The configurations shown in the above embodiments are examples of the contents of the present disclosure. The configurations of each embodiment can be combined with other known technologies. The configurations of each embodiment can also be combined as appropriate. Part of the configuration of each embodiment can be omitted or modified without departing from the gist of the present disclosure. [Explanation of symbols]

[0059] REFERENCE SIGNS LIST 1 main body case, 2 base, 3 control board, 4 main circuit board, 5 front cover, 6 operation unit, 7 first connector, 8 second connector, 9 harness, 10 third connector, 11 fourth connector, 12 bulkhead, 13 opening, 20, 20A, 20B, 20C first connector holding mechanism, 21, 21A, 21B first right arm, 22, 22A, 22B first right side hold portion, 23, 23B first right bottom hold portion, 24, 24A, 24B first left arm, 25, 25A, 25B first left side hold portion, 26, 26B first left bottom hold portion, 27, 27A, 27B first side hold portion, 28, 28B first bottom hold portion, 30, 30A, 30B, 30C second connector holding mechanism, 31 Second right arm, 32 second right side holding portion, 33 second right bottom holding portion, 34 second left arm, 35 second left side holding portion, 36 second left bottom holding portion, 37 second side holding portion, 38 second bottom holding portion, 40 connector holding mechanism, 41 first inclined surface, 42 rib, 43 second inclined surface, 44 protrusion, 45 hole, 100 inverter (power conversion device).

Claims

1. a first substrate on which a first connector is mounted; a second substrate on which a second connector is mounted; a main body case that accommodates the first substrate and the second substrate; a harness having one end which has a third connector that can be mated with the first connector and the other end which has a fourth connector that can be mated with the second connector, and electrically connecting the first board and the second board; a second connector holding mechanism disposed on an inner peripheral wall surface of the main body case and holding the fourth connector; a first connector holding mechanism disposed on an inner peripheral wall surface of the main body case and holding the third connector; A power conversion device comprising:

2. The main body case includes: a partition wall that divides an internal storage space into a first storage space and a second storage space, the first substrate being stored in the first storage space, and the second substrate being stored in the second storage space; The second connector retention mechanism includes: the fourth connector is disposed on an inner peripheral wall surface of the main body case on the second accommodating space side, and holds the fourth connector; The first connector retention mechanism includes: the third connector is disposed on an inner peripheral wall surface on the second accommodating space side that is closer to the partition wall than a position where the second connector holding mechanism is disposed, and holds the third connector; The partition wall is 2. The power conversion device according to claim 1, wherein an opening for inserting the first connector is formed at a position corresponding to a position where the first connector holding mechanism is disposed.

3. The harness is The power conversion device according to claim 2, characterized in that the first board is assembled in a predetermined position in the main body case in a state in which the third connector is held by the first connector holding mechanism and the fourth connector is held by the second connector holding mechanism, so that the first connector and the third connector are mated through the opening, and the second board is accommodated in a predetermined position so that the second connector and the fourth connector are mated.

4. The first connector retention mechanism includes:

4. The power conversion device according to claim 3, wherein the first board is arranged in a position where the third connector held by the first connector holding mechanism can be mated with the first connector when the first board is assembled in a predetermined position on the partition wall.

5. The second connector retention mechanism includes: The power conversion device according to claim 3, characterized in that when the second board is accommodated in a predetermined position within the main body case, the fourth connector held by the second connector holding mechanism can be mated with the second connector.

6. The second substrate comprises:

6. The power conversion device according to claim 3, wherein the power conversion device is mounted on a base, and the base is mounted on the main body case, whereby the power conversion device is accommodated in a predetermined position within the main body case.

7. The first connector retention mechanism includes:

5. The power conversion device according to claim 1, further comprising a first pair of arms that sandwich the sides of the third connector and simultaneously support the bottom surface of the third connector.

8. The first pair of arms include: a first side holding portion that restricts the third connector from moving in a direction parallel to a bottom surface of the third connector; a first bottom surface holding portion that restricts the third connector from moving in the mating direction of the first connector; 8. The power conversion device according to claim 7, further comprising:

9. The first side holding portion includes:

9. The power conversion device according to claim 8, wherein an inner wall surface of an entrance portion into which the third connector is inserted has a first inclined surface.

10. The first side holding portion includes: The first side holding portion has an inner wall surface provided with a rib extending vertically from the first bottom holding portion, The rib is 9. The power conversion device according to claim 8, wherein the tip has a second inclined surface.

11. The first pair of arms include:

8. The power converter according to claim 7, wherein the arms are disposed on the inner peripheral wall surface of the main body case at intervals wider than at least the thickness of the cables of the harness.

12. The second connector retention mechanism includes:

6. The power conversion device according to claim 1, further comprising a second pair of arms that sandwich the side surfaces of the fourth connector and simultaneously support the bottom surface of the fourth connector.

13. The second pair of arms includes: a second side holding portion that restricts the fourth connector from moving in a direction parallel to a bottom surface of the fourth connector; a second bottom surface holding portion that restricts the fourth connector from moving in the mating direction of the second connector; 13. The power conversion device according to claim 12, further comprising:

14. The second side holding portion is 14. The power conversion device according to claim 13, wherein an inner wall surface of an entrance portion into which the fourth connector is inserted has a first inclined surface.

15. The second side holding portion is The second side holding portion has an inner wall surface provided with a rib extending vertically from the second bottom holding portion, The rib is 14. The power converter according to claim 13, further comprising a second inclined surface at the tip.

16. The second pair of arms includes:

13. The power conversion device according to claim 12, wherein the arms are disposed on the inner peripheral wall surface of the main body case at intervals wider than at least the thickness of the cables of the harness.

17. The first connector holding mechanism and the second connector holding mechanism include:

6. The power converter according to claim 1, wherein the main body case is integrally formed with the inner peripheral wall surface thereof.

18. The first connector holding mechanism and the second connector holding mechanism include: a protrusion at a portion in contact with the inner peripheral wall surface of the main body case; The main body case includes: a hole formed in the inner peripheral wall surface at a position corresponding to the protrusion when the first connector holding mechanism and the second connector holding mechanism are disposed on the inner peripheral wall surface of the main body case; The first connector holding mechanism and the second connector holding mechanism include:

6. The power conversion device according to claim 1, wherein the power conversion device is disposed on the inner peripheral wall surface of the main body case by fitting the projection into the hole.

19. the first board is a control board, 6. The power conversion device according to claim 1, wherein the second board is a main circuit board.

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